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ARTICLE IN PRESS Eclogite-facies polyphase deformation of the Drbsdal eclogite,

Eclogite-facies polyphase deformation of the Drbsdal eclogite,
Western Gneiss Complex, Norway, and implications
for exhumation
Ruth Foremana,*, Torgeir B. Andersenb
, John Wheelera
Department of Earth and Ocean Sciences, University of Liverpool, 4 Brownlow Street, Liverpool, UK
Institute for Geology and PGP, University of Oslo, PO Box 1047, Blindern, Oslo 0316, Norway
Received 24 October 2003; accepted 1 October 2004
Exhumation of the deep crust during orogenic extension is accepted as a geological phenomenon, but structures formed
during burial and the earliest stages of exhumation are often overprinted by deformation events occurring at shallower crustal
levels. The Western Gneiss Complex (WGC) of Norway comprises variably retrogressed high-pressure (HP) and ultrahigh-
pressure (UHP) eclogite bodies enclosed in predominantly felsic amphibolite-facies rocks. The Drbsdal body, located in the
Sunnfjord area, is one of the largest and best-preserved eclogites in the WGC, and comprises over ca. 3 km2
of exposed
eclogite-facies rocks. It is an excellent example of an eclogite tectonite, and displays a wealth of structures formed during
deformation at a minimum depth of 50 km and peak temperatures of ca. 800 8C. Large volumes of mylonites with the eclogite-


Source: Andersen, Torgeir Bjørge - Centre for Physics of Geological Processes & Department of Geosciences, Universitetet i Oslo


Collections: Geosciences